Setting aside religion, at some point, don't you have to consider the number of miraculous events which had to happen as they did, for intelligent life to exist here? What would be the odds of those same events happening elsewhere?
That "logic" is based on the pompous fallacious assumption that ALL intelligent life MUST be exactly like us!!! NOT a very intelligent assumption. To other possible intelligent life, YOU may be no more "intelligent" than an insect.
The fact remains, the ONLY intelligent life we have to go by is our own. Unless we find life existing elsewhere, under a different set of variables and conditions, the only intelligent and logical assumption to make is that which is self evident. We cannot assume that life could even exist under a different set of variables and conditions. I'm not saying it's impossible, only that, whatever forces enabled the special circumstances in play here, would also be in play elsewhere, if life exists.
Your last point is actually a very good one. We have a word in which we invented to define what we realize as human cognizant rationalization and thought... Intelligent. We have no way of knowing or understanding anything beyond that. This is where I think a strong argument can be made for Spiritual Nature. If it's possible for you to rationalize that what we perceive as "intelligence" might only be on the level of an insect in relation to a superior intelligence, then it's possible for an omniscient Creator to exist. So you've actually, unwittingly, made a rational argument for the existence of God. Good work!